"Chatinbox" is not named by any product page, so the request is ambiguous; the candidates below are chat and messaging platforms that could serve as the underlying infrastructure. Stream 3, Twilio 2 and Novu 6 offer chat or messaging APIs for building in-app or cross-channel messaging, and Matrix 8 and Element 9 offer an open, end-to-end encrypted messaging network.
A question back: Chatinbox is not a product named on any of the pages I read. Do you mean a chat-inbox feature for your own app, a shared inbox for customer messages, or a chatroom for AI agents?
- 1
Stream Chatgetstream.ioverified and signed
Stream provides SDKs and APIs for building any in-app chat or messaging experience, with SDKs for React, Swift, Android, Flutter and other platforms 3.
+1 community tools built for it
for agents: messaging · chat · conversation
- 2
Twilio Conversationstwilio.comverified and signed
Twilio's Conversations product connects channels into one continuous conversation that persists across channels and sessions, and its Programmable Messaging API sends SMS, MMS, RCS and WhatsApp messages 212.
official:SDK · twiliolibrary · Twilioskill · twilio-send-messageSDK · twilio+19 community tools built for it
for agents: get_message · twilio-send-message · custom_api_call
- 3
Novunovu.cofound in code, not yet checked
Novu is an open-source notification and agent communication infrastructure that connects products to customers across in-app, email, SMS, push, WhatsApp, Slack and other channels through one API 6.
+1 community tools built for it
for agents: inbox_list · inbox_show · inbox_reply
- 4
- 5
Elementelement.ioverified and signed
Element is a Matrix-based end-to-end encrypted messenger and collaboration app that can be self-hosted or run through a hosting service 9.
+5 community tools built for it
for agents: api · rest · web
Sources
- 2Docs: API Reference, Tutorials, and Integration | Twiliotwilio.com · read 2026-10-29
- 3Scalable Chat, Video & Activity Feed APIs and SDKs | Streamgetstream.io · read 2026-10-29
- 6Novu - Connect your AI agents and products to customersnovu.co · read 2026-10-30
- 8You're invited to talk on Matrixmatrix.to · read 2026-10-30
- 9Element | Secure collaboration and messagingelement.io · read 2026-10-30
- 12Twilio (Activepieces): declares "get_message" (the record we read and signed)unfragile.ai · read 2026-10-24
- 18Matrix (Activepieces): declares "send_message" (the record we read and signed)unfragile.ai · read 2026-10-24
For agents: the 10 actions behind this answer
GetSessionChat · Cloudflare API verified and signed
Fetch all chat messages of a session
get_message · Twilio (Activepieces) verified and signed
Get Message — Get the status and details of a sent or received message.
messaging · stream-chat verified and signed
websocket · pusher-js verified and signed
Check inbox · Roomcomm verified and signed
One call instead of polling every room: new messages past your watermark in all your rooms plus fresh mentions of your agent_id in those rooms. Needs a key. e.g. {"op":"check_inbox"} e.g. /inbox
inbox_list · novu found in code, not yet checked
List the conversations in the agent's inbox. People can message the agent first: call this with filter "unread" before you send, so you see new conversations. Conversations with strangers are hidden unless senders is "all". Showing a conversation does not mark it read; any send into it does.
custom_api_call · GitHub (Activepieces) verified and signed
Custom API Call — Make a custom API call to a specific endpoint
send_message · Matrix (Activepieces) verified and signed
Send Message — Send a message to a room
api · jira verified and signed
generate_text · Cohere (Activepieces) verified and signed
Generate Text — Generate a text response using Cohere AI Chat API
Labels are the instruments' verdict and are never changed by ranking. Agents and robots get this same answer as JSON at /api/v1/find?q=…&answer=1 and through the MCP server.